toEmbeddedDataStoreValue

Convert the given Java value to its datastore equivalent. If this
mapping occupies multiple columns, return an object array with one
element per column. For relation id columns, return the state manager
the column depends on.

loadEmbedded

Load this strategy's field by transforming the given datastore value.
If getColumns() returns multiple columns, the given datastore
value will be an object array of the corresponding length. The value
does not have to be loaded immediately; it may be stored as impl data.